One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, ...

The powerful gravity of a galaxy embedded in a massive cluster of galaxies in this Hubble Space Telescope photo is producing multiple images of a single distant supernova far behind it. Both the ...

Several telescopes used to observe the supernova SN Zwicky which was magnified nearly 25 times by a foreground galaxy acting ...

Discovery of SN 2025wny: A Strongly Graviatationally Lensed Supernova at z=2.01. Joel Johansson et al (2025). Oskar Klein Centre, Stockholm University An international team of astronomers led by Oskar ...

A distant stellar explosion has offered astronomers a rare natural experiment, one that turns gravity into a powerful optical tool. The object, known as SN 2025wny, appears not once but four times in ...